Well, manufacturing will only return to the US, if it's cheaper than other options. And of course its not only China that is a player in this game. If China gets banned from trading with the US, there are several other "cheap" countries waiting to get a piece of the cake. Mexico can be one of them, but also India, Vietnam, Malaysia and more.
Also it not only western companies who have factories in China or elsewhere, that are the problem. Its the native companies that compete with the western companies, too.
Anyway, what ever they decide, the biggest loser will be the american consumer. If the cheap imported goods disappear from the shops, he will have to pay the higher prices. It certainly wont be the import companies, or Walmart or who ever, who will cover for the tarrifs - it gets passed along to the consumer at the end. And the same result comes from repatriation of the manufacturing.
That would, admittedly, create lots of new jobs. But the pay would need to go up to make ends meet - wich in turn causes prices to rise again. Which requires pay to go up further ect. ect.... And there is the inflation spiral.